An electronic mailing list is a list of email addresses that get the very same message simultaneously. When you send an email to the mailing list address, your message will be forwarded to all the email addresses on that mailing list automatically, but none of the receivers will know who the rest of the recipients are. In the general case, people have to subscribe to a mailing list, but sometimes mailboxes are included manually without their owners’ awareness. Depending on the particular list management software, you may also be able to add new mailing list subscribers, so users will not be able to join your mailing list unless you approve their signup request. The mailing list functionality is very handy if you want to send regular newsletters or some other type of regular notifications to customers, since you will have to send just a single email and all of the mailing list subscribers will get it instantaneously. As a consequence, you won’t have to insert multiple email addresses manually.